The LAI-2200C Plant Canopy Analyzer calculates Leaf Area Index (LAI) and other canopy structure attributes from radiation measurements made with a “fish-eye” optical sensor (148° field-of-view). Measurements made above and below the canopy are used to determine canopy light interception at 5 angles, from which LAI is computed using a model of radiative transfer in vegetative canopies. An integrated GPS module allows each above- or below-canopy reading to be paired with GPS data for that location.